20805920

素因数分解:

$2^5\times 5^1\times {\mathrm{109}}^1\times {\mathrm{1193}}^1$

素因数の和:1317

約数の個数: 48

約数和(自身を含む): 49646520

約数和(自身を除く): 28840600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 109, 160, 218, 436, 545, 872, 1090, 1193, 1744, 2180, 2386, 3488, 4360, 4772, 5965, 8720, 9544, 11930, 17440, 19088, 23860, 38176, 47720, 95440, 130037, 190880, 260074, 520148, 650185, 1040296, 1300370, 2080592, 2600740, 4161184, 5201480, 10402960, 20805920]

約数ペア:

[(1, 20805920), (2, 10402960), (4, 5201480), (5, 4161184), (8, 2600740), (10, 2080592), (16, 1300370), (20, 1040296), (32, 650185), (40, 520148), (80, 260074), (109, 190880), (160, 130037), (218, 95440), (436, 47720), (545, 38176), (872, 23860), (1090, 19088), (1193, 17440), (1744, 11930), (2180, 9544), (2386, 8720), (3488, 5965), (4360, 4772)]